Revert of Remove --enable-per-tile-painting and --ui-enable-per-tile-painting.

cc/base/switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/base/switches.h"
 
 #include "base/command_line.h"
 
 namespace cc {
 namespace switches {
@@ skipping 68 matching lines @@
 const char kStrictLayerPropertyChangeChecking[] =
     "strict-layer-property-change-checking";
 
 // Virtual viewport for fixed-position elements, scrollbars during pinch.
 const char kEnablePinchVirtualViewport[] = "enable-pinch-virtual-viewport";
 
 const char kEnablePartialSwap[] = "enable-partial-swap";
 // Disable partial swap which is needed for some OpenGL drivers / emulators.
 const char kUIDisablePartialSwap[] = "ui-disable-partial-swap";
 
+const char kEnablePerTilePainting[] = "enable-per-tile-painting";
+const char kUIEnablePerTilePainting[] = "ui-enable-per-tile-painting";
+
 // Enables the GPU benchmarking extension
 const char kEnableGpuBenchmarking[] = "enable-gpu-benchmarking";
 
 // Renders a border around compositor layers to help debug and study
 // layer compositing.
 const char kShowCompositedLayerBorders[] = "show-composited-layer-borders";
 const char kUIShowCompositedLayerBorders[] = "ui-show-layer-borders";
 
 // Draws a FPS indicator
 const char kShowFPSCounter[] = "show-fps-counter";
@@ skipping 99 matching lines @@
   if (command_line.HasSwitch(switches::kDisableMapImage))
     return false;
   else if (command_line.HasSwitch(switches::kEnableMapImage))
     return true;
 
   return false;
 }
 
 }  // namespace switches
 }  // namespace cc